Marin Mersenne 2^P-1
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Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

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MnStatusDetails
2198591Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
378916121923191445.1old
ECM
DigitsB1Curves
2550000280 / 280
30250000161 / 640
Estimated T-Level: 26.3
TF below 2^82 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-10-09Oliver Kruse51FA68D1E017DD2D1013
Verified2017-11-19kkmrkkblmbrbk51FA68D1E017DD2D1170121413
History
DateUserTypeResult
2017-11-19kkmrkkblmbrbkC-PRP
M2198591/37891612192319 : 51FA68D1E017DD2D
PRP: Verified
PRP without proof (not generated)
2017-10-09Oliver KruseC-PRP
M2198591/37891612192319 : 51FA68D1E017DD2D
PRP: Verified
PRP without proof (not generated)
2016-04-01alpertronNF-PM1
B1=500000, B2=15000000, E=12